package com.jacken.mars.controller.tool;

import cn.hutool.core.codec.Base64;
import com.google.code.kaptcha.Producer;
import com.jacken.mars.commons.annotation.BaseAnnotationNote;
import com.jacken.mars.commons.constant.CommonConstants;
import com.jacken.mars.entity.resp.R;
import com.jacken.mars.utils.uuid.IdUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.TimeUnit;

/**
 * 验证码操作处理
 *
 * @author wq
 */
@RestController
@RequestMapping("/admin/captcha")
public class CaptchaController {

    @Resource(name = "captchaProducer")
    private Producer captchaProducer;

    @Resource(name = "captchaProducerMath")
    private Producer captchaProducerMath;

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    public static final String[] captchaType = new String[]{"math", "char"};


    /**
     * 生成验证码
     */
    @GetMapping("/image")
    @BaseAnnotationNote(checkToken = false)
    public R getCode(HttpServletResponse response) throws IOException {
        int index = (int) (Math.random() * captchaType.length);
        //String type = captchaType[index];
        String type = "math";
        // 保存验证码信息
        String uuid = IdUtils.simpleUUID();
        String verifyKey = CommonConstants.CAPTCHA_CODE_KEY + uuid;
        String capStr = null, code = null;
        BufferedImage image = null;

        // 生成验证码
        if ("math".equals(type)) {
            String capText = captchaProducerMath.createText();
            capStr = capText.substring(0, capText.lastIndexOf("@"));
            code = capText.substring(capText.lastIndexOf("@") + 1);
            image = captchaProducerMath.createImage(capStr);
        } else if ("char".equals(type)) {
            capStr = code = captchaProducer.createText();
            image = captchaProducer.createImage(capStr);
        }
        stringRedisTemplate.opsForValue().set(verifyKey, code, CommonConstants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try {
            ImageIO.write(image, "jpg", os);
        } catch (IOException e) {
            return R.error(e.getMessage());
        }
        R data = R.success();
        Map<String, String> map = new HashMap<>();
        map.put("uuid", uuid);
        map.put("img", Base64.encode(os.toByteArray()));
        data.setData(map);
        return data;
    }
}
